Tube-mill.



F. E. MARCY.

TUBE MILL.

APPLICATION FILED JAN.13 1917.

Patented' May 15, 1917.

2 SHEETS-SHEET I.

vIJv'VEJvT01 c. 57m/f E-Ndrcg- F. E. MARCY.

TUBE MILL.

APPLICATION FILED IAN. I8. 19H.

Pnented May 15, 1917.

2 SHEETS-SHEET 2.

ffm/f w IIIIIIIIIIIIII WITNESSES:

TUBE-MILL.

incassa.

Specification of Letters Patent.

Patented ay t5, 19M'.

' A-dpplieatitm illed January 18, 1917. l Serial No. 143,077.

To all whom @'15 may concern Beit known that I, FRANK E. or, a

`citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new! and useful improvements in Tube-Mills, of which the followin is a full, clear, and exact description, re erence being had to the accompanying drawings, forming a -part hereof.

Myl invention has relation to improvementsin tube mills; and it consists in the novel features of construction more fully set forth in the specification and pointed out in the claims.

The' present invention is primarilyy directed to that feature of the m1ll known as the screen-grate, that 'is to say, the transverse perforated diaphragm interposed between the crushingr compartment -or chamber of the mill andthe discharge head, andy secondari'ly to the wall'liner on which the life of the grate and feed-end liner are in a measure dependent. lheinvention has for its obJect, to provide special means for securing the grate in position without regard tothe de-.

tailed construction of the grate', such securing means being applicable to fa ca sty grate,

to one composed of ,rolled bars welded or not welded, to a grate com osed of spil-ally disposed bars, to one ,having its bars disposed radiallyor parallel to the chords of the circular cross-section of the shell of the mill,

or to a grate having its bars disposed lin any other manner known to the art. A furthery object is to provide special means for anchoring the member inclosing and carrying the' pinge destructively `against the grate'.(and` feed-end liner) thereby avoiding pockets and holes in the grate; and finally, to provide further and other features of construction the advantages of which will be readily apparent 'om the following detailed de scrlption of the'invention in'connection with the accompanying drawings in which- Figure l Arepresents a side elevation of the mill withjparts in section, la portion of the shell being removed; Fig. 2 is a plan of the.

inclosing for the grate s howlng-in plan one-half of .the rate in position within. the rlng, the v1ew. eing taken from the side facing the radial lifters- .of thedischarge head against whichthe outer face of the grate bears, three of the lifters (there are six 1n the present mill) being shown outlined by dotted lines in the space from .which the grate has been removed "to show their disposition relatively tothe ring and grate when the parts are assembled; Fig. 3 is a half transverse section and edge view of the i grate and its inclosin line 3-3 of Fig. 2; i ig. 4 is an enlarged cross-section through lthe discharge` head and two of the radial lifters and through the grate, on the line 4 4 of Fig. l; Fig. 5 is an inner face view of a portion of the dis` charge head and its lifterS; Fig. 6 vis an end View of oneof the wall-liner sections; Fig. 7 is an innerfplan or face view of one of the vwall liner sections; Fig. 8 is a perspective of one of the grate bars with portion broken away; Fig. 9 is a view similar-to Fig.` 2 showing a grate composed of rolled bars welded together; Fig. 10 is a cross-section'on the line 10-10 of Fig. 9; Fig. l1 is a perspective of one of the rolled bars with lportion ring on the zig-zag broken away; Fig. 12 is an end view of 'a Referring to the drawings, and for the present to Figs. 1 to 8 inclusive, l represents I theouter shell of the crushing compartmentl of a cylindrical container, drum, tumbling barrel or equivalent tubular member, the/v same being provided with a suitable wall liner 2 and a feed-end liner 2. Theifee'd- -end head 3 of the mill is provided withthe vhollow feed-trunnion ll, the discharge-end head 3' being provided with the hollow discharge trunnion 5 as well understood in the art. Formed on the inner face of the'discharge-head 3 are a `series of radial blades' or lifters @against which the grate is adapted to bear when the `latter with its inclosing rin'g'is properly mounted within the mill.

vention six lifters 6 are employed (thoughev l am not restricted to the actual number employed) said lifters being T-shaped in crosssection' as shown (Fig. 4) the flanges ofthe ,lifters directly affording a rest for the grate bars'.y ln the present construction the entire tion 1 carrying the feed-head 3, andthe relashell of the drum comprises the large sec-V In the present embodiment of my in-4 105 tively smaller section 1 carryingthe discharge-head 3, the two sections being bolted to one another along the flanges a, a', of the respective sections, the smaller section carrying the drive 7. The grate-supporting faces of the radial lifters, that is to say the faces of the flangeslo-f the lifters are disposed in the plane of the annular ledge 8 projecting from the inner walls of the shellsection 1', said ledge being removed a suitable distance from the flanged terminal of said section. The' wall liner 2 terminates at the flanged terminal of the sectio-n 1, so'that when thev shell sections are assembled, there is left an annular space between the ledge 8 and the adjacent terminal of the wall liner 2 to accommodate the grate |inclosing and supporting ring 9, the details of which are fully shown in Figs. 1, 2, and 3.\ This ring is L-shaped in cross-section, that is to say the ring is provided with an inwardly turned flange h (Fig. 3) on the inner face of which the grate Jbars 10 composing the grate are initially deposited, the depth of the bars being slightly in excess ofthe width of the inner annular face of the ring (Fig. 3) so that the grate projects a slight distance beyond the ring to engage the radial lifters 6 and ledge 8, between which and the flange L the grate isheld confined when the parts are assembled (Fig. 1). v The bars 10 are cast bars and are formed with suitable spacing lugs d to properly space the bars. At diametrically opposite points the ring 9A is pro- -Vided with flat sections orportions fm for the accommodation of suitable set screws 11 by which the grate-bars are firmly and sufliciently driven against one another and frictionally held inthe ring to permit the ring and grate .to be deposited as a unit with-4 in the shell section 1 before the latter is bolted to the section l.' At diametrically opposite points, and removedl ninety degrees from the flat portions m, the periphery of the ring 9 is provided with recesses t (open at one end only) with which engage suitable lugs 12 formed on the inner wall of the shell section 1, said lugs 12 and recesses t locking the ring against rotary displacement when once deposited in position in the mill. In addition, the section 1 is tapped circumferentially at intervals for the reception of set screws 13 which operate to tightly clamp the ring 9-in position and hold the same against possible movement in any direction.

In mills 'where .a transverse grate or diaphragm is disposed in the manner here shown there necessarily are formed two distinct compartments within the mill, to wit, va crushing compartment C, and a finishing compartment C', the first compartment bescription but briefly stated is as follows: The

material is fed to the mill through the hollow trunnion l into the crushing compartment C, where it is ground during the rotation of the mill about its axis, the fine particles passing through the screen-grate composed of the bars 10 (or their equivalents) and entering the radial sub-compartments formed by the lifters 6 in the finishing compartment C (between the grate and the head 3'), whence the finished product passes out through the 'trunnion 5 to any suitable point for .further \treatment. The coarse particles which cannot pass through the grate remain in the crushing compartment until sufficiently reduced in size. a

In the grate above described the Several bars modification shown in Figs. 9 and 10 additional means for holding the bars 10 together are provided in the shape of welds fw between the spacing lugs d', but extending only partially the depth yof the bar, no change being made however in the ring 9 by which the grate is supported. Again, the bal'sinstead of being cast may be rolled, the roller bar 10 preferably assuming a shape on the order shown in the modica tion in Fig. 11, the spacing lugs d being rolled as a part of the original bar from which the bars forming the grate are subsequently cut off'. It is apparent that the invention herein is susceptible of a large variety of modifications both in the grate and supporting ring therefor', and likewise in the discharge head and lifters thereof, and it is therefore unnecessary to adhere to the forms here shown to be within the spirit of my invention. Thus in the ring 9, the supf port for the grate need not necessarily be a flange such as L, but may be any suitable ledge or support vproperly disposed ony the ring to serve itspurpose. The ring 9 is not absolutely indispensable as other means might be improvised by the skilled mechanicto maintain the grate in position Without departing from the spirit of my invention.

As pointedl out above, one of the objects sought by the present invention is to prevent the disintegration of the grate by the impact of the balls rolling down the wall liner 2 with the rotation of the mill. These liners asxwell understood in the art are provided with lifters, corrugations, or ribs r f or lifting the balls and material through a certain arc of the mills rotation, the balls when released upon reaching their highest the contents ofthe mill to be again lifted v were held together by friction, Abut in the .and subsequently released as fully under-v' stood-in the art. Where the liters extend the full length of the VWall-liner, the balls Y of the liner a racewayb is left beyond the 10 :terminal 'of the lifter or rib, the balls freely l@rolling down thisv race-Way and not Vseri'- ously 'impinging-against thegratel (or end liner), The` 'pockets and holes resulting from the use` of, full length lifters are thus avoided, and v`the"'lii`e of the grate (as Well as of the feed-end liner 2). is materially T prolonged.'- vrIhe Wall liner is preferably built up of longitudinal sections 20, 20,

il, "(Figs. 6, 7)-, the-metal tapering from the rib rto the 'edge of lthe section, said -edge being interposed between the ribbed side'of ,an adjacent section'and theshell 1, the parts y 5 f beingsecured'v byrivets, bolts or Aany equiva- -L' lent 'Way known to thel art. At the ends e,

that is, beyond the terminals of the ribs, vthe metal is preferably yof substantially uniform thickness, the Weight of metal however at i the ends being `substantially equal to that of themetal in any other portion of the liner having thesame length; By therefore .terf

minating the litters 1' a'short distance from the vgrate (and feedend liner) Aa ballrace b is formed betweenthe lifter terminal and grate contiguous thereto,` through which I race the balls'yvill roll-Without damaging thegrate; The lifters need not of course be integral with the linersectio'ns.v In Figs. 12

and 13 I show a modied linerl section 20 having a central'lifter r the same operating i othe samev as the abbreviated lifter 7' previ-f ously described. y' vIn this modification the longitudinal edges of the several sections 20 v for locking the ring to theshelL and a grate are placed in abutting relation. vf Having described i. In combinaties with' a dijiiotatabief f abou-ta exea axis-and provided withahead my invention what I.-

piece ring encompassing and having means for holding the grate and operating tomaintain. the same in proximity to the lifters. 2.' In 'combination with a drum' rotatable about a fixed axis and provided Witha head having an opening -for the passage of the material, a series of radial blades or lifters dlsposed on the inner surface of'the'head around said opening, a grate, a ring in the drum providedwith a flange for engaging `the grate, the latter being positioned between the lifters and said flange.

- 3; Inl combination with the perlpheral` Walls of atube mill providedwith suitable I lugsextending toward the axis of the mill,

a flanged' one-piece grate-holding ring progvidedwith peripheral recesses for engaging saidv lugs, thereby preventing rotary displacement of the ring.

4. In a mill of on, a series of grate-bars deposited on the iange, and means on the ring for drivlng the, .bars .into .firm frictional engagement withone'another Wherebylthef'ring and bars maybe handled as a 'unitn' v l5. In a mill of the character described, a

,grate comprising a series of bars, spacing lugs on the bars'formaintaining the bars Aber .being insertible into the" shell .of the mill, and means on the shell for locking the member to the shelll n A the characterdescribed, a suitable ring, a ledge or flange formed theree.l in a min of the 'chamaeraesmbea a i shell section provided with a head, radiall lifters disposedon the inner vface of the head, a ledge leading from the innei-Walls of the shelland forming they outer'boundary of the litters, a 'ring mounted -in the shellsection in proximity to the lifters, means carried bythe ring and-engagingthelifters 

